Portable forge.



A. S. WALKER. PORTABLE FORGE.

APPLICATION FILED MAR. 11, I916.

1,212,293. Patented Jan.16,1917.

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UNITED @TAIIEE PAQ EIWI @FFIQE,

ALBERT S. WALKER, 0F BUFFALQ, NEVJ YGRK, ASSIGNOR TO H. G. TRGUT COIvIPANY, 0F BUFFALO, NEVI YORK, A CORPGRATIGN OF NEW YORK.

PORTABLE FORGE.

Specification of Letters Patent.

Patented Jan. 16, 19917.

Application filed March 11, 1916. Serial No. 83,492.

To all whom it may concern.-

Be it known that I, ALBERT S. WALKER, a citizen of the United States, residing at Buffalo, county of Erie, and State of New York, have invented certain new and useful Improvements in Portable Forges; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

One object of my invention is to provide an apparatus for using compressed air to induce the blast in a portable forge. By this method a comparatively small quantity of compressed air may serve to induce the blast in a forge of the ordinary portable type,thus allowing many forges to be run by the same quantity of compressed air that would supply but one forge when driven air only is used.

Another object of this invention is to provide a grate of such form that the blast, coming through the draft tube, is evenly distributed throughout a bed of burning fuel.

In the accompanying drawing: Figure 1 represents diagrammatically a portable forge with my draft apparatus applied thereto. Fig. 2 shows an enlarged cross section of my draft tube and inducing nozzle. Fig. 8 is a partial plan of the draft tube and perforated circular grate.

My complete forge consists of a suitable basin or hearth A preferably of iron and provided with legs B; a draft tube C, which is contracted in its middle portion, projects through a hole in the bottom of the basin A, and has its lower and upper ends made flaring, the lower being open, and a pipe P with a nozzle E on the end thereof, which nozzle projects into the draft tube and ends at or near the upper end of the lower flaring part. On the other end of the pipe P is avalve F, within easy reach, to control the pressure of the air in the pipe. The nozzle is preferably centerwise of the draft pipe. I show the grate D broken, so as to show the nozzle E in the center of the draft tube C in Fig. 3.

It will be noticed that the holes in the out side circlein the grate are of larger diameter or more numerous than the inner ones. The purpose of this is to equalize the intensity of the blast, and consequently the quantity of air supplied to the fire over the whole surface of the grate by interposing more resistance to the blast in the center, where it is more intense, due to the center driving directly in line with the nozzle E, and hence in the direct path of the blast.

My draft tube is straight and vertical, thus enabling me to lead the air directly and Uni formly to the hearth, thereby avoiding eddies, and reflected and pulsating currents. The upper flaring portion K of the draft tube serves to insure the mixing of air from the two sources, to a large extent, almost completely in fact, and the shape of the grate apertures corrects any remaining irregularity in the blast.

In the operation of this forge an air hose, which is connected to a source or tank of compressed air, G, is connected to the standard air hose coupling H, the valve F is opened and compressed air permitted to pass through the pipe P and out of the nozzle E, under the pressure of the tank, with great velocity. In passing through the straight section K of the draft tube C this jet of air draws in the air in the immediate vicinity of the nozzle with it, thus forming a partial vacuum; the outside air rushes 113 through the lower flaring part K to fill t is partial vacuum, and is carried up by its acquired velocity through the central part K and the upper flaring chamber K through the grate D and the fuel bed above, thus furnishing the necessary oxygen to the fire in the same manner as any other blast. It will be noted that I have thus provided a simple, efl'ective and economical means for supplying air to a portable forge, by means of which one source of air supply may be made to serve several forges.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a portable forge, in combination, a hearth, a grate therefor, a vertical draft tube having flaring upper and lower ends, connected to said grate, a nozzle projected into said draft tube and terminating near the top of the lower flare, said lower end of the draft tube being open, and means for supplying said nozzle with air under pressure, whereby additional air is induced through said fiarstraight draft pipe leading to said grate, ing lower end and to the hearth. there being a flare at each end of said ipe,

2. In a portable forge, in combination, a and an injector pipe entering said pipe rom 10 hearth, a grate for said hearth, said grate below and ending at about the top of the i 5 constructed to afford more resistance to the lower flare. passage of air at its center than at its pe- In testimony whereof, I aiiix my signature. riphery, an upwardly directed, substantially ALBERT S. WALKER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, I). C. 

